Qion
Uber Nothing
I wouldn't use an ipod for this, its not such a durable drive as the full size ones. I like the Lacie d2 triple interface drives, they have USB2, Firewire and Firewire800 (for crazy transfer speeds). Just don't get the Lacie Porche drives. I have an 80, 250 and 300gb lacie d2 and they've been great.
What's wrong with the Porsche drives? I've got one at my studio...?
Collectively, they make some pretty good laptop-form factor external hard drives. A lot of them are reinforced with rubber or whatnot because they are intended for travel. Just look around online a bit.